Besides the many other factors mentioned by commenters here, I'll add one other: drivers in the US rarely face consequences for killing pedestrians or, for that matter, other drivers, even when it's the result of willfully negligent or reckless behavior. It's such a longstanding trend that it's become a meme: if you want to get away with murder, make sure to kill your victim with a car. "I didn't see them/I made mistake" works so well that authorities just don't bring charges, because juries are so willing to accept this excuse. Perhaps because so many of them can see themselves doing the same thing.
See: https://freakonomics.com/podcast/why-is-the-u-s-so-good-at-k...